English to Swedish Tech/Engineering Mechanics / Mech Engineering

Repair manual for the excavator.

Dismantling components
Before starting work, depressurize piping and hoses, cylinders, radiator, hydraulic tank and other systems or units. Replace defective components in good time to prevent major damage. Clean the defective component carefully before dismantling it. When dismantling the component, close off exposed hose and piping connections, exposed drill holes and housings carefully to prevent any dirt from penetrating. Never remove **lead seals**. Never remove **lead seals** from pressure relief valves and accumulators.

Lead as in 'bly' or 'huvud-' or something else?